Used as a key intermediate in the synthesis of agrochemicals and pharmaceuticals, particularly in the development of herbicides and fungicides. Its sulfonyl chloride group readily reacts with amines and alcohols, making it valuable for introducing the 2-methylquinoline moiety into larger molecules. It is also employed in the preparation of fluorescent probes and dyes due to the inherent fluorescence of the quinoline ring system. In medicinal chemistry, it serves as a building block for kinase inhibitors and other bioactive compounds targeting inflammatory and oncological pathways.